Mr Li said that governments at all levels should be responsible and spare no efforts to guarantee the targets in the new government work report.
Speaking at an executive meeting of the State Council, he stressed that stabilising economic growth by providing strong policy support, flexible monetary tools, more job opportunities and proper controls and regulations.
The council passed a plan for sustainable development in agriculture, to ensure food security and better living for farmers.
The plan demands securing the area and quality of farmland and about 53 million hectares of high-quality farmland has been targeted to be cultivated by the end of 2020.
Mr Li said that a greater variety of agricultural businesses will improve efficiency, while water conservation and protection of forests, wetland, grassland and lakes in rural area are to be strengthened.
The premier also called for better port management with easier and transparent customs clearance.
More approvals for customs clearance will be cut, inspections improved and illegal fees rooted outs.
Transregional cooperation and better port layouts will support cross-border e-commerce areas.
In the meeting, the premier delivered a government work report announcing China's 2015 economic growth target of approximately seven per cent.
The government needs to continue red-tape reduction and reform of taxation, financing and investment, to invigorate the market and clear the path for entrepreneurship, Mr Li said.
He called for more service supply and faster construction of railways in central and west China, major water conservation projects and renovating substandard housing, as well as wider global cooperation in equipment manufacturing.